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Finding the Fourth Proportional to 1,794.15, 2,689.61 and 639.63

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Solution

The fourth proportional to 1,794.15, 2,689.61 and 639.63 is: 958.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,794.15 : 2,689.61 = 639.63 : x
  2. Step 2: Convert to fraction form
    1,794.15/2,689.61 = 639.63/x
  3. Step 3: Cross multiply
    1,794.15x = 2,689.61 × 639.63
  4. Step 4: Simplify right side
    1,794.15x = 1,720,364.53
  5. Step 5: Solve for x
    x = 1,720,364.53/1,794.15
  6. Step 6: Final answer
    x = 958.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.